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Finding the Fourth Proportional to 674.52, 1,013.40 and 431.52

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Solution

The fourth proportional to 674.52, 1,013.40 and 431.52 is: 648.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    674.52 : 1,013.40 = 431.52 : x
  2. Step 2: Convert to fraction form
    674.52/1,013.40 = 431.52/x
  3. Step 3: Cross multiply
    674.52x = 1,013.40 × 431.52
  4. Step 4: Simplify right side
    674.52x = 437,302.37
  5. Step 5: Solve for x
    x = 437,302.37/674.52
  6. Step 6: Final answer
    x = 648.32

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.